English printing

: Add one mana of any color. Spend this mana only to cast a creature spell.

"The key to bonding with monsters, no matter their size, is knowing where they like to be scratched."

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Oracle

Humble Naturalist

Creature — Human Druid

{T}: Add one mana of any color. Spend this mana only to cast a creature spell.

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Rulings

Mana produced by Humble Naturalist can be spent on any part of a creature spell’s total cost, including additional costs (such as kicker costs) and alternative costs (such as mutate costs). It can’t be spent to pay the costs of abilities of creatures you control. [0000-00-00]